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- Which carbocation would be least stable? II + + III IV VWhich of the following carbocations would be expected to rearrange? None of these would be expected to rearrange. „CH3 CH;CCH,CH3 ČH3 .CH3 „CH315. Which of the following carbocations is the most stable? a) ethyl carbocation, CH3CH2+ b) rpropyl carbocation, CH3CH2CH2* c) Isopropyl carbocation, (CH3)2CH* d) t-butyl carbocation, (CH3)3C+
- Which of the following carbocations is the most stable? A B D A B MeO C O₂N DPlease don't provide handwritten solution....In light of your answer to Problem 11-74, explain why one of the following isomers undergoes E2 reaction approximately 100 times as fast as the other. Which isomer is more reactive, and why?
- 4. Rank the following carbocations according to stability (1: most stable, 5: least stable.) e A OCH3 +4. Rank the following carbocations according to stability (1: most stable, 5: least stable.). ht t tá OCH 3 +Stereochemistry The alkyl bromide below can undergo an E2 but not in its shown conformation. Draw the conformer (as a line drawing, not a Newman projection) out of which an E2 elimination can occur, with all bonds/groups in the original drawing included. 'Bu = tert-butyl H3C H H3C Br tBu alkyl bromide (b) Draw the alkene formed in the E2 elimination reaction of this alkyl bromide promoted by potassium tert-butoxide (KOtBu). (c) Indicate if this E2 elimination reaction is stereospecific or stereoselective (write or circle stereospecific or stereoselective) Regioselectivity (d) Two potential products can form in the following E2 elimination promoted by KOtBu. Circle the major alkene product. (e) KOtBu H3C H3C Indicate if the reaction in (d) is under kinetic control or thermodynamic control. (write or circle kinetic or thermodynamic control) 5
